Document Type and Number:
Japanese Patent JPS5248435
Kind Code:
U
Application Number:
JP13331275U
Publication Date:
April 06, 1977
Filing Date:
October 01, 1975
Export Citation:
International Classes:
G02B23/18; (IPC1-7): G02B23/18
Domestic Patent References:
| JPS4216595Y1 | 1967-09-25 | |||
| JPS3824139Y1 | ||||
| JP46036236U |